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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Advances in Multi-Principal Elements Alloys X: Structures and Modeling
Presentation Title High Thermal Stability B2 precipitates in a Ru-containing Multi-Principal Element Alloy
Author(s) Carolina Frey, Ravit Silverstein, Tresa Pollock
On-Site Speaker (Planned) Carolina Frey
Abstract Scope Refractory Multi-principal Element Alloys (RMPEAs) present an opportunity for new high temperature alloys that can operate above 1200C, but mechanical properties are currently limited by the lack of strengthening precipitates that are stable at high temperatures. Two phase microstructures composed of coherent B2 and BCC phases in (Al, Ti, Zr)-containing RMPEAs demonstrate high compressive strengths to 1000C but the B2 phase is not stable beyond 1200C. This presentation will discuss an equiatomic HfNbTaRuZr RMPEA synthesized by arc melting and annealed in a vacuum furnace between 1300 and 1575C. BCC, B2, and HCP phases in annealed materials were identified by both x-ray diffraction and transmission electron microscopy, with all phases stable up to 1575C. Refinement of the microstructure was achieved by splat quenching. Hardness measurements are reported for as-cast and splat quenched materials and compared to literature values. CALPHAD predictions are evaluated and implications for high temperature strengthening will be discussed.
Proceedings Inclusion? Planned: TMS Journal: Metallurgical and Materials Transactions
Keywords High-Entropy Alloys, High-Temperature Materials, Mechanical Properties


A Comprehensive Overview of the Serrated Plastic Flow Phenomenon in Multi-Principal Element Alloys
A High-Throughput Investigation of Microstructure-Property Relationships in NbVZr
A method to predict fluctuations in the fault energy landscape of FCC solid solutions
Atomic scale analysis on local chemical ordering in high entropy alloys
Atomistic Modeling of Diffusive High Temperature Plasticity in BCC Refractory-based MPEAs
Atomistic modeling of dislocations in refractory high-entropy alloys
Atomistic modeling of vacancy concentration and tracer diffusion in Ni-CoCrFeMn alloys
Atomistic Simulations of Mechanical Responses and Defect Activities in B2 Low-to-High-Entropy Intermetallic Compounds
Beyond Configurational Entropy: a harmonic multi-principal elements alloy
Characterization of high-entropy titanate pyrochlore oxide single crystals
Charge transfer effect on local lattice distortion in a HfNbTiZr high entropy alloy
Chemical Randomness and Lattice Distortions in Multi-Principle Elements Alloys: Advances in Characterization
Combination of high throughput experiments and ICME approaches to discover the composition space for lightweight high entropy alloys
Computational Study of Thermodynamic and Thermoelectric Properties of Al-Co-Cr-Fe-Ni and Al-Cu-Fe-Mn-Ni High-Entropy Alloys
Controlling Short-Range Ordering to Simultaneously Enhance Strength and Ductility of High-Entropy Alloys
Critical Shear Stress Distributions and Dislocation Mobility in FeNiCrCoCu High Entropy Alloys via Atomistic Simulations
Data-Driven Discovery of High-entropy Alloys
Design of High Temperature RCCAs using Ordered Thermally Stable Structures
Developing Interatomic Potentials for High Entropy Alloys
Development of Novel Refractory High-entropy Alloys via High-throughput Alloy-design Approach
Dislocation dynamics in particle hardened high-entropy alloys
Effect of composition and processing on the stacking fault energy of a metastable high entropy alloy
Effective atomic size in multi-principal element alloys
Effects of Short-Range Order on Thermodynamic Properties of AlxCoCrFeNi High-Entropy Alloys
Electron diffraction-based studies of ordering and mechanical behavior in FCC and BCC multi-principal element alloys
Energy landscape of deformation twinning in multi-principal elements bcc alloys
Expediting the materials discovery process of MPEAs through efficient coupling of high-throughput density functional theory, molecular dynamics and machine learning techniques
Experimental, Theoretical, and Numerical Study for Dynamic Strain Aging in HfNbTaTiZr High-Entropy Alloys
Exploration of refractory complex concentrated alloys through the use of high-throughput calculations and experimentation
Exploring Multi-Principal Elements Alloys using interpretable physics-based machine learning
Factors affecting stacking fault energy in concentrated alloys using density functional theory and machine learning
First-Principles-based High-Throughput Prediction of the Phase Stability of Refractory Complex Concentrated Alloys
First-principles exploration of diffusion activation energy in CoCrNi and CoCrFeNiMn high-entropy alloys, with comparison to creep activation energy
First-principles study of Quaternary High Entropy Alloys consisting of Fe-Ni-Co-Cr-Mn/Pd
First-principles Study of the Phase Stability and Secondary Phase formation in the AlxCoCrFeNi High-entropy Alloys
First Principles Prediction of Mechanical Properties of High Entropy Alloys
High-Throughput Ion Irradiation and Microstructural Characterization of Multi-Principal-Element Alloys
High-Throughput Mapping and Screening of Refractory High Entropy Alloy Property Space
High-throughput simulation of finite-temperature elasticity and phase stability of TiZrHfTax alloys with near-DFT accuracy via machine-learning interatomic potentials
High Thermal Stability B2 precipitates in a Ru-containing Multi-Principal Element Alloy
Impact of short-range ordering on the planar slip of 3d transition metal-based complex concentrated alloys
In-situ 4D-STEM imaging of the synergistic deformation mechanisms responsible for the fracture resistance in CrCoNi
Interactions between a dislocation and a twin boundary/HCP lamella and their temperature dependence in Ni-based equiatomic alloys
Interplay between dislocations and correlated stress environment in random alloys
Jerky dislocation motion in multi-principle element alloys: From atomic Peierls stress to dislocation mobility
KMC modeling of screw dislocation strength in equiatomic bcc refractory alloys
Local configuration effects on vibrational properties of BCC MPEAs
Machine-Learning and High-Throughput Studies for High-Entropy Materials: Building Beyond & Above
Machine learning enabled defect energies prediction in concentrated alloys
Machine learning guided descriptor selection for predicting corrosion resistance in multi-principal element alloys (MPEAs)
Magnetism in Metastable and Annealed HEAs of (FeNiCrMn)
Mechanical properties and deformation behavior of a refractory multiprincipal element alloy under cyclic loading
Melting temperature prediction of Multi-Principal Elements Alloys using ab-initio calculations
Metastability and phase selection in High Entropy Alloys
Microstructural Inversion Accompanied by B2 to hP18 Phase Transformation in a BCC based Refractory Complex Concentrated Alloy
Microstructure and mechanical properties of medium-entropy alloys with high-density nano precipitates
Mixing and Diffusion at Internal Interfaces in High Entropy Alloys
Modeling the Effect of Stress and Composition on the Stability of Lomer/Lomer-Cottrell Dislocations
Multiscale Dynamics of the Oxide Scale in High-Entropy Alloys
Multiscale mechanical characterization of nanocrystalline and coarse grain refractory HEAs
Multiscale modeling and design of high entropy alloys
Novel Co-free multi principal element alloys (MPEAs) for nuclear applications: computational design and experimental evaluation
Optimizing Microstructure and Mechanical Properties of Multi-principal Elements Alloys via Thermal Treatments
Phase Field Modelling of Transformation Pathways and Microstructural Evolution in Multi-Principal Element Alloys (MPEAs)
Phase Transition Zones in Compositionally Complex Alloy Films
Polymetallic MOF derived high entropy FeCoNiMnMo/NC nanoparticles for efficient alkaline Hydrogen Evolution Reactions
Predicting fundamental properties of refractory multicomponent alloys using electronic descriptors and statistical learning
Revealing phase transformation and deformation behavior in a B2-base high-entropy alloy by in-situ neutron diffraction
Revealing strengthening mechanisms in refractory multi-principal elements alloys
Short-range Order and Planar-Slip Assisted Deformation Twinning in a CrCoNi Medium-Entropy Alloy (MEA)
Short range order observed in NbTaTiVZr using scanning transmission electron microscopy
Simulations of deformation and fracture in multi-principal element alloys.
Size Effects in a Dual Phase High Entropy Alloy
Slip localization in the refractory high entropy alloy HfNbTaTiZr at room temperature
Structural and Compositional Inheritances of Intermetallic Phases in High-entropy Alloys
TEM study of a refractory complex concentrated alloy with BCC/B2 microstructure
The impact of short-range order on atomic diffusions in multi-principal elements alloys
Theory of Yield Strength in BCC High Entropy Alloys
Transformation behavior and superelasticity of TiZrHfNiCoCu multi-component high-temperature shape memory alloys
Understanding Chemical Short-Range Ordering/Demixing Coupled with Lattice Distortion in Solid Solution High Entropy Alloy
Unveil the Origin of Segregation-assisted Hardening in CoCrNi-Alloys with varying Mo Content Using Correlative TEM/APT Microscopy
Using Materials Informatics and Computer Simulation to Identify Promising High-Entropy Alloys
Vacancy Defects: formation energy and migration paths in multi-principal-element alloys (MPEAs)

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